What you need to setup your own pi phone server!

A server
I used a VPS from DirectSpace
Networks, buget VPS hosting starts at $4/month. FranTech has some budget VPS that start at only $15/year when
they are available that are also fun.I have had trouble with DirectSpace not recording my paypal subscription
for 2 months in a row and am currently suspended. I no longer recommend
them!

A phone number.
I used IPKall which provides free DIDs.
I am assuming that IPKall supports a maximum of a 2 hour phone call...
because that's the longest anyone has called for. My assumption was wrong,
the longest call so far has been for a single 238 minute call!